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Security system for mass transit vehicles

  • US 20070241894A1
  • Filed: 04/18/2006
  • Published: 10/18/2007
  • Est. Priority Date: 04/18/2006
  • Status: Abandoned Application
First Claim
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1. A point-of-entry security system for ground-based mass transit vehicles comprises:

  • an electromagnetic field generator comprising a pair of induction coil sending/receiving units mounted at either side of the doorway or entranceway of said mass transit vehicle for detecting metallic objects passing through the electromagnetic field produced by said generator;

    means for providing electric energy to, and for controlling the sensitivity of, said generator; and

    , means for generating audio and/or visual signals when a metallic object of predetermined size or density is encountered by said electromagnetic field.

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